Ebatzi: a, b, c, d
a=2\pi n_{1}+\arccos(\frac{1}{4})\text{, }n_{1}\in \mathrm{Z}\text{, }b=2\pi n_{1}+\arccos(\frac{1}{4})\text{, }n_{1}\in \mathrm{Z}\text{, }c=2\pi n_{1}+\arccos(\frac{1}{4})\text{, }n_{1}\in \mathrm{Z}\text{, }d=2\pi n_{1}+\arccos(\frac{1}{4})\text{, }n_{1}\in \mathrm{Z}
a=2\pi n_{2}+2\pi -\arccos(\frac{1}{4})\text{, }n_{2}\in \mathrm{Z}\text{, }b=2\pi n_{2}+2\pi -\arccos(\frac{1}{4})\text{, }n_{2}\in \mathrm{Z}\text{, }c=2\pi n_{2}+2\pi -\arccos(\frac{1}{4})\text{, }n_{2}\in \mathrm{Z}\text{, }d=2\pi n_{2}+2\pi -\arccos(\frac{1}{4})\text{, }n_{2}\in \mathrm{Z}
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